Capacitive Touch Input Pad Layout for Accurate Sensor Adjustment
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Solution Overview
Problem
Existing capacitive touch sensors face malfunctions due to variations in device characteristics and external influences during manufacturing adjustments, leading to inaccurate correction values and malfunctioning sensors.
Innovation Solution
The input apparatus incorporates an adjustment pad with worse measurement conditions, positioned away from the operation area and separated by an air layer, to determine a correction value for the operation pad, allowing for proper adjustment and operation despite external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch sensor is adjusted during manufacturing by measuring the pad output, then the sensor can be corrected to a reference value, but external objects may approach or contact the pad causing inaccurate measurement values
Solution Approach 1:
The invention divides the pad into two separate pads: a first pad for normal touch detection and a second pad specifically for adjustment measurements. This segmentation isolates the measurement function from the operational function, preventing external objects intended for touch interaction from interfering with adjustment measurements.
Solution Approach 2:
The invention introduces a dielectric member positioned between the first pad and the base material, which serves as an intermediary to reduce external electrostatic influence during adjustment measurements while allowing normal touch detection to function properly.
2Reliability
If the pad is positioned close to the base material for sensitive touch detection, then touch sensitivity is improved, but external objects have greater influence on the capacitance measurement
Solution Approach 1:
The invention creates separate functional zones: the first pad operates close to the base material for sensitive touch detection, while the second pad is positioned with a dielectric member to minimize external influence during adjustment, allowing each pad to optimize its specific function.
Solution Approach 2:
The invention applies different structural configurations to different pads: the first pad uses a configuration optimized for sensitivity (close to base material), while the second pad uses a configuration optimized for measurement accuracy (with dielectric member), allowing each local region to have the quality needed for its specific purpose.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables accurate adjustment and operation of the touch sensor by minimizing external interference, ensuring reliable detection and correction of capacitance changes without affecting normal user interactions.
Implementation Method 1
at least one first pad arranged on the substrate so as to face the base material via a dielectric member and configured to detect a capacitance
Implementation Method 2
at least one second pad arranged on the substrate so as to face the base material via an air layer and configured to detect a capacitance
Data Source
AI summary
An input apparatus includes a base material facing the outside and configured to serve as an operation surface of the input apparatus; a substrate arranged so as to be on the inner side, i.e., the opposite side to the operation surface of the input apparatus, and so as to face the base material; at least one first pad arranged on the substrate so as to face the base material via a dielectric member and configured to detect a capacitance; at least one second pad arranged on the substrate so as to face the base material with an air layer therebetween and configured to detect a capacitance; and a control section connected to the first and second pads, and configured to control the first and second pads.